Introduce ViewRoot forwarding input/view events to native

ui/android/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/rules.gni")
 import("//testing/test.gni")
 
 assert(is_android)
 
 component("android") {
@@ skipping 24 matching lines @@
     "resources/resource_manager.h",
     "resources/resource_manager_impl.cc",
     "resources/resource_manager_impl.h",
     "resources/ui_resource_provider.h",
     "screen_android.h",
     "ui_android_export.h",
     "ui_android_jni_registrar.cc",
     "ui_android_jni_registrar.h",
     "view_android.cc",
     "view_android.h",
+    "view_client.cc",
+    "view_client.h",
+    "view_root.cc",
+    "view_root.h",
     "window_android.cc",
     "window_android.h",
     "window_android_compositor.h",
     "window_android_observer.h",
   ]
 
   defines = [ "UI_ANDROID_IMPLEMENTATION" ]
 
   deps = [
     ":java_enums_srcjar",
     ":ui_android_jni_headers",
     "//base",
     "//cc",
     "//cc/surfaces",
     "//cc/surfaces:surface_id",
     "//skia",
     "//ui/display",
+    "//ui/events",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }
 
 static_library("test_support") {
   testonly = true
   sources = [
     "dummy_screen_android.cc",
     "dummy_screen_android.h",
   ]
 
   deps = [
     "//ui/android",
     "//ui/display",
   ]
 }
 
 generate_jni("ui_android_jni_headers") {
   sources = [
     "java/src/org/chromium/ui/OverscrollRefreshHandler.java",
     "java/src/org/chromium/ui/base/ViewAndroidDelegate.java",
+    "java/src/org/chromium/ui/base/ViewRoot.java",
     "java/src/org/chromium/ui/base/WindowAndroid.java",
     "java/src/org/chromium/ui/display/DisplayAndroidManager.java",
     "java/src/org/chromium/ui/resources/ResourceManager.java",
   ]
   jni_package = "ui_android"
 }
 
 java_cpp_enum("java_enums_srcjar") {
   sources = [
     "../base/ime/text_input_type.h",
@@ skipping 75 matching lines @@
     "java/src/org/chromium/ui/VSyncMonitor.java",
     "java/src/org/chromium/ui/base/ActivityWindowAndroid.java",
     "java/src/org/chromium/ui/base/AndroidPermissionDelegate.java",
     "java/src/org/chromium/ui/base/Clipboard.java",
     "java/src/org/chromium/ui/base/DeviceFormFactor.java",
     "java/src/org/chromium/ui/base/LocalizationUtils.java",
     "java/src/org/chromium/ui/base/ResourceBundle.java",
     "java/src/org/chromium/ui/base/SelectFileDialog.java",
     "java/src/org/chromium/ui/base/TouchDevice.java",
     "java/src/org/chromium/ui/base/ViewAndroidDelegate.java",
+    "java/src/org/chromium/ui/base/ViewRoot.java",
     "java/src/org/chromium/ui/base/WindowAndroid.java",
     "java/src/org/chromium/ui/display/DisplayAndroid.java",
     "java/src/org/chromium/ui/display/DisplayAndroidManager.java",
     "java/src/org/chromium/ui/display/DisplaySwitches.java",
     "java/src/org/chromium/ui/display/PhysicalDisplayAndroid.java",
     "java/src/org/chromium/ui/display/VirtualDisplayAndroid.java",
     "java/src/org/chromium/ui/gfx/BitmapHelper.java",
     "java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     "java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
     "java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
@@ skipping 47 matching lines @@
     "//base:base_java",
     "//ui/android:ui_java",
   ]
 }
 
 test("ui_android_unittests") {
   sources = [
     "overscroll_refresh_unittest.cc",
     "resources/resource_manager_impl_unittest.cc",
     "run_all_unittests.cc",
+    "view_android_unittest.cc",
   ]
   deps = [
     ":android",
     ":java_enums_srcjar",
     ":ui_java",
     "//base",
     "//base/test:test_support",
     "//cc",
     "//cc:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
+    "//ui/events",
     "//ui/gfx",
     "//ui/resources:ui_test_pak",
   ]
 }